I've been trying to find a straight-forward post on hair proteins for a while now. This is great! I purchased the Suave Keratin Infusion Condish a couple months ago and used it weekly. I loved it b/c it left my hair super smooth and manageable, but I was losing my hair in CRAZY clumps. I wish I had known Keratin was a protein. I honestly believed it to be a silkening agent. Glad I figured it out in time before I lost all of my hair, though. :-)

I've never done a brazilian blow dry/keratin treatment and don't really know much about it. My aunt had a thinning edges and saw success with scalp massages with oils that contain sulfur and castor oil (peppermint and rosemary can also be added). Hope that helps!